shear failure of foundation unit.
R,r
Radius of pile, caisson well or other
right circular cylinder.
R+o,
Radius of influence of a well,
distance from the well
along a radial line to the point
where initial groundwater level
is unaltered.
r+e,
Effective radius of sand drain.
r+s,
Radius of smear zone surrounding sand
drain.
r+w,
Actual radius of sand drain.
S
Percent saturation of soil mass.
SI
Shrinkage index.
7.1-S-2
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